Stop motion for drawing frames



March 10, 1931. w. J. SCOTT STOP MOTIION FORDRAWING FRAMES 2"Sheets-Sheet 1 Filed Nov. 30, 1929 mnnmmmm WMW m A TTORNEYS.

March 10, 193]. w, J, S T 1 1,795,799

STOP MOTION FOR DRAWING FRAMES Filed Nov. 50, 1929 2 Sheets-Sheet 2VENTOR. fly Q z/a/y/ Snail/ 0 6M flank-w A TTO RNEYS slivers which passthru the draft rolls, the i Patented Mar. 10, 1931 WALTER :r. scorn orwooivsooxn'r, :anonn ISLAND V I STOP MOTION FOR DRA ING FRAMESApplication filed November 30, 1929. Serial No. 410,712.

This invention relates to an electric stop motion for machines fordrawing textile fibres, such as drawing frames, gill boxes and the like,and is an improvement on my prior Patent No. 1,722,769, dated July 30,1929; and an object of this invention is to provide a stop motion havingan electric circuit closing unit located adjacent the line oftravel ofthe unit having a plurality of contact members, each arranged to beoperated independently of the other by engagement with anyone of aplurality of broken slivers to affect the circuit and stop the machine.

,A further object of the invention is the provision of means forsupporting these contact fingers in avertical position, whereby the fallof a broken sliver upon the contact finger will move the same to closethe circuit and stop the machine. v The invention further consists inthe constructing of a row of these vertically disposed contact fingersto. extend across the line of travel of the slivers, and arranging themin a plane below the normal line of travel of these slivers whereby whenany one of the slivers is broken it will fall upon and engage one of thefingers and its weight together with the travel of the sliver will causethe fingers to move to complete the circuit and stop the machine.

With these and other objects in view, the invention'consists of certainnovel features of construction, as will be more fully described, andparticularly pointed out in the appended claims. I

In the accompanying drawings: Figure 1 is a side elevation showing thegeneral arrangement of portions of the usual mechanism for a drawingframe with my improved contact unit applied thereto and indicating oneof the slivers as having been broken and lying upon one of the contactfingers and having moved that finger to complete the circuit and stopthe machine.

Fig. 2 isa view showing an end view of the guide plate with aset of myimproved contact fingers connectedto the frame of the machine adjacentthis guide plate.

Fig. 3 is an enlarged edge view-partly in section showing the unit asbolted in position contact fingers.

at the base of the guide plate'and the relative positions of the contactbar and the flexible Fig. 4 is a section on line 4-4 of Fig. 2.' Fig. 5is a section on line 55 of Fig. 2, showing one of the fingers in dottedlines as having been sprung forward to contact with the contact bar. I,I 1

Fig. 6 shows a strip of very thin tempered metal slit to formreadilybendable contact fingers. Fig. 7 is a modification showing asideelevation of gill box construction with my improved stop motion unitapplied thereto. 7 i

Fig. 8 is a sectionalview looking in the direction of. the arrow in Fig.7 showing my improved stop motion. as attached to the frame of a gillbox and its position relative to the rear draft rolls.. g

Flg. 9 is a diagrammatic view illustrating.

the wiring diagram in whichthe contact fingers are arranged toclose thecircuit by the weight or action of a broken sliver to operate thebelt-shifting lever. i

It is found in the practical operation of drawing frames, gill boxes andthe like thru which textile fibres are drawn by a set' of drawing rollsthat quite often one or more of these slivers are broken and when thisoccurs the remaining slivers which continue to run naturally form a thinplace'in the yarn andthis' defective condition may be continued for sometime before being discovered by the operator; and to obviate this dif--ficulty, I have provided an automatically operable stop motion whichconsists of a plurality of readily'bendable fingers or ele-. I

ments arranged in a row to extend across the line of travel of theslivers, each finger being arranged to operate independently of theother so that when any one of these running slivers breaks and fallsinto contact with any one of these fingers, that finger will yieldindependently of the other under the weight and the forward drawingaction of the sliver and bend forward into contact with anothercontactingelement to completethe electric circuit and stop the machine.improved circuit closer is herein shown as formed in a single unit whichmay be constructed complete independently of the machine and is adaptedto be readily attached in working position to the machine and as readilyremoved for inspection and repairs; and the following is a detaileddescription of the present embodiment of my invention and showing onemeans by which these advantageous results may be accomplished:

lVith reference to the drawings, 10 designates a plurality of supplypackages which may be spools, bobbins and the like on which slivers 11are wound and from which these slivers are led thru the slots 12 in theguide plate 13, thence over and around the back draft rolls 14 thru thecarrier rolls 15 and the front rolls 16 and after being drawn out ordrafted, the yarn is fed thru the flyer 17 to be wound upon the spool orbobbin 18 which is raised and lowered on its spindle 21a thru action ofthe rack 19 and pinion 20, which spindle and spool is rapidly rotated bythe whirl 21 thru the belt 22 and pulley 23. It is found in practicethat the sliver ends often break down at some point between the supplypackage 10 and the guide plate 13, as illustrated in Fig. 1, at 24, andthat when this occurs and the remaining sliverscontinue to run withoutbreaking down, and without the broken sliver, a thin place in the yarnis nautrally formed and when later discovered necessitates cutting outand loss of the thin portion, and piecing up the broken ends andstarting over again with the required number of ends. I

To obviate this difficulty, I have provided automatic means in the formof an electric stop motion which I attach to the machine, the sameincluding a circuit closing unit which comprises a plate 25 of suitablelength to which is attached a bracket 26 arranged to be attached by abolt 27 to the guide plate 13,

see Fig. 3. Mounted on this plate 25 is a contact bar 28 preferably ofcarbon which is retained in the casing 29 to extend forward from theplate 25. A front plate 30 is supported from the back plate 25. by meansof the depending arms 31 and the bolts 32.

In order to form a set of very flexible contact fingers I employ a strip33. of'very thin tempered steel, the same being split as at 34 along oneedge to provide a plurality of spaced contact fingers 35 and this stripof metal is. secured to this front bar 30 by means of bolts 36 with thefree ends of the fingers of the strip extending upwardly and extendingin a row across the line of travel of the slivers as they run thru theguide plate 13. By means of the bolts 32 and binding nuts 37 thereon,this plate with its contact fingersmay be adjusted laterally relative tothe contact bar 28, so that the proper distance between the contact barand these fingers may be readily obtained.

In order to protect the free ends of these r delicate fingers from beinginadvertently engaged and moved to close the circuit, I have positioneda guard plate 38 which is supported on the rods 39 and bound in positionthereon by means of binding nuts 40, Whereby these fingers normally restback against this guard plate and are permitted to be engaged by thefalling of a broken sliver, the weight of which is sufiicient to bendthese delicate fingers forward into contact with the contact bar 28 toclose the circuit and stop the machine. y

In additionto the weight of this broken sliver in falling upon thecontact fingers, the continued forward feeding movement of this brokensliver also'assists in bending these fingers forward into engagement bythe contact bar to complete the electric circuit.

My improved stop motion unit may be applied to any sliver feeding anddrawing machine and in Figs. 7 and 8 is illustrated as being applied toa gill box,in which case the unit 41 is shown as being located in frontof the rear draft rolls 42 of the gill box and as illustrated in Fig. 8these spaced fingers extend the full length ofthe rolls across themachine. 7 r I As above described, this set of flexible bendable fingersis supported in the plate 24 and is insulated therefrom by the fibrewashers 43, as shown" in Fig. 5, and is conend falls and rests upon oneof these very thin flexible fingers 35, a row of which extendsacross'the path of the running slivers,

whereby the weight of the sliver causes the finger'engaged tospringforwardly into contact with the carbon rod 28, thus completing the.circuit to energize the electromagnet 46,

trip the latch 47 and release the lever 48,

which thru the action of spring 49 throws the 4110 rod 50 and shifts thebelt from thetight pulley 51 to the loose pulley 52' thus stopping themachine. The electric circuit is herein shown as being normallyopenbutto so arrange the finger 35 that its movementv will open thecircuit instead of closing it, will fall within the spirit and scope ofthis invention. V 7

My improved stop motion for drawing frames is extremely simple andpractical in its construction and operation and by its use much time issaved andwaste of good textile material is prevented for by its use themoment a sliver is broken the machine is stopped which immediately givesnotice to the operator who then pieces up the ends and after the troubleis. corrected the machine is started again.

I claim:

1. In a machine for drawing textile fibres,

a set of sliver supply packages, a set of draft rolls, an electriccircuit, a stop motion in said circuit, andcircuit closing meanspositioned contact bar, said sheet being connected in said circuit,whereby movement of any finger in response to engagement of a brokensliver will complete the circuit and stop the machine, a I

2. In a machine for drawing textile fibres, a set of sliver supplypackages, a set of draft rolls, an electric circuit, a stop motion insaid circuit, and circuit closing means positioned beneath the line oftravel of the slivers including a contact bar, a sheet of resilientmaterial having spaced slots providing separate flexible contact fingersadapted to be independently moved into engagement with said contact bar,and a support bar against which said fingers normally rest, said sheetbeing connected in said circuit, whereby movement of any finger inresponse to engagement of a broken sliver will complete the circuit andstop the machine.

3. In a machine for drawing textile fibres, a set of sliver supplypackages, a set of draft I rolls, an electric circuit, a stop motion insaid circuit, and circuit closing means positioned beneaththe line oftravel of the slivers including a contact bar, a sheet having separateflexible contact fingers each adapted to r be independently moved intoengagement with said contact bar, said sheet being'coir nected'in saidcircuit, whereby movement of any finger in response to engagement of abroken sliver will complete the circuit and stop the machine. v

4. In a machine for drawing textile fibres, a set of sliver supplypackages, a set of draft rolls, an electric circuit, a stop motion insaid circuit, and circuit closing means positioned beneath the line oftravel of the slivers including a contactbar, a sheet having separateflexible contact fingers each adapted to be independently moved intoengagement with said contact bar, and a support bar against which saidfingers normally rest, said sheet being connected in said circuit,whereby movement of any finger in response to engagement of a brokensliver will complete the circuit and stop the machine. In testimonywhereof I affix my signature.

WALTER J. SCOTT.

